通过GSON使用Volley获取错误来解析JSON

问题描述：

如何使用GSON库和Volley解析低于JSON。通过GSON使用Volley获取错误来解析JSON

[ 
    { 
     "code": 1, 
     "message": "Scan Details", 
     "result": [ 
      { 
       "Inbound Date": "2017-10-13", 
       "Outobund Date": "2017-10-16", 
       "Inbound": "3", 
       "Outbound": "3", 
       "Outbound Pending": "0" 
      }, 
      { 
       "Inbound Date": "2017-10-16", 
       "Outobund Date": "2017-10-16", 
       "Inbound": "3", 
       "Outbound": "2", 
       "Outbound Pending": "1" 
      } 
     ] 
    } 
]

我已经创建了POJO类：

DashboardPojo_BK

import java.io.Serializable; 
import java.util.List; 
import com.google.gson.annotations.Expose; 
import com.google.gson.annotations.SerializedName; 
import org.json.JSONObject; 

public class DashboardPojo_BK implements Serializable { 

    @SerializedName("code") 
    @Expose 
    private Integer code; 
    @SerializedName("message") 
    @Expose 
    private String message; 
    @SerializedName("result") 
    @Expose 
    private List<ResultDashboard_BK> result = null; 

    public Integer getCode() { 
     return code; 
    } 

    public void setCode(Integer code) { 
     this.code = code; 
    } 

    public String getMessage() { 
     return message; 
    } 

    public void setMessage(String message) { 
     this.message = message; 
    } 

    public List<ResultDashboard_BK> getResult() { 
     return result; 
    } 

    public void setResult(List<ResultDashboard_BK> result) { 
     this.result = result; 
    } 

}

ResultDashboard_BK

import com.google.gson.annotations.Expose; 
import com.google.gson.annotations.SerializedName; 

import java.io.Serializable; 

public class ResultDashboard_BK implements Serializable { 

    @SerializedName("Inbound Date") 
    @Expose 
    private String inboundDate; 
    @SerializedName("Outobund Date") 
    @Expose 
    private String outobundDate; 
    @SerializedName("Inbound") 
    @Expose 
    private String inbound; 
    @SerializedName("Outbound") 
    @Expose 
    private String outbound; 
    @SerializedName("Outbound Pending") 
    @Expose 
    private String outboundPending; 

    public String getInboundDate() { 
     return inboundDate; 
    } 

    public void setInboundDate(String inboundDate) { 
     this.inboundDate = inboundDate; 
    } 

    public String getOutobundDate() { 
     return outobundDate; 
    } 

    public void setOutobundDate(String outobundDate) { 
     this.outobundDate = outobundDate; 
    } 

    public String getInbound() { 
     return inbound; 
    } 

    public void setInbound(String inbound) { 
     this.inbound = inbound; 
    } 

    public String getOutbound() { 
     return outbound; 
    } 

    public void setOutbound(String outbound) { 
     this.outbound = outbound; 
    } 

    public String getOutboundPending() { 
     return outboundPending; 
    } 

    public void setOutboundPending(String outboundPending) { 
     this.outboundPending = outboundPending; 
    } 

}

这是POST请求我现在用在这里，我可以解析数据，但是当数据由GSON设置为POJO类时会出现问题。

以下是我使用Volley库解析的JSON。

String url = Constants.BLOOMKONNECT_DASHBOARD; 
    Log.e("URL",""+url); 

    StringRequest eventoReq = new StringRequest(Request.Method.POST, url, 
      new Response.Listener<String>() { 
       @Override 
       public void onResponse(String response) { 
        Log.e("RESPONSE", response.toString()); 

        utils.hideDialog(); 
        try { 
         JSONArray j = new JSONArray(response); 

         // Parse a json 
         for (int i = 0; i < j.length(); i++) { 
          try { 
           JSONObject obj = j.getJSONObject(0); 
           String code = String.valueOf(obj.get("code")); 
           Log.e("CODE", "" + code); 

           if(code.equals("1")){ 
            utils.showtoast("i m here"); 



            Gson gson = new Gson(); 
            Type listType = new TypeToken<ResultDashboard_BK>() { 
            }.getType(); 
            ResultDashboard_BK pojo = gson.fromJson(response.toString(), listType); 
            Log.e("DATA",""+pojo); 

           } else { 
            utils.hideDialog(); 
            utils.showtoast("Unexpected Response"); 
           } 


          } catch (JSONException e) { 
           e.printStackTrace(); 
          } 

         } 

        } catch (JSONException e) { 
         e.printStackTrace(); 
        } 


       } 
      }, new Response.ErrorListener() { 
     @Override 
     public void onErrorResponse(VolleyError error) { 
      Log.e("Error: ", "" + error.getMessage()); 
      //hidePDialog(); 

     } 
    }) { 
     @Override 
     protected Map<String, String> getParams() { 
      // Posting parameters to login url 
      Map<String, String> params = new HashMap<String, String>(); 
      params.put("user_id", userId); 
      Log.e("USER_ID",""+userId); 
      return params; 
     } 
    }; 

    // Añade la peticion a la cola 
    AppController.getInstance(this).addToRequestQueue(eventoReq);

的error_log

com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was BEGIN_ARRAY at line 1 column 2 
      at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:176) 
      at com.google.gson.Gson.fromJson(Gson.java:803) 
      at com.google.gson.Gson.fromJson(Gson.java:768) 
      at com.google.gson.Gson.fromJson(Gson.java:717) 
      at com.kabloom.kbinternal.activities.BloomKnctDashboard$3.onResponse(BloomKnctDashboard.java:142) 
      at com.kabloom.kbinternal.activities.BloomKnctDashboard$3.onResponse(BloomKnctDashboard.java:118) 
      at com.android.volley.toolbox.StringRequest.deliverResponse(StringRequest.java:60) 
      at com.android.volley.toolbox.StringRequest.deliverResponse(StringRequest.java:30) 
      at com.android.volley.ExecutorDelivery$ResponseDeliveryRunnable.run(ExecutorDelivery.java:99) 
      at android.os.Handler.handleCallback(Handler.java:751) 
      at android.os.Handler.dispatchMessage(Handler.java:95) 
      at android.os.Looper.loop(Looper.java:154) 
      at android.app.ActivityThread.main(ActivityThread.java:6165) 
      at java.lang.reflect.Method.invoke(Native Method) 
      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:888) 
      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:778) 
     Caused by: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was BEGIN_ARRAY at line 1 column 2 
      at com.google.gson.stream.JsonReader.beginObject(JsonReader.java:374) 
      at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:165) 
      at com.google.gson.Gson.fromJson(Gson.java:803)  
      at com.google.gson.Gson.fromJson(Gson.java:768)  
      at com.google.gson.Gson.fromJson(Gson.java:717)  
      at com.kabloom.kbinternal.activities.BloomKnctDashboard$3.onResponse(BloomKnctDashboard.java:142)  
      at com.kabloom.kbinternal.activities.BloomKnctDashboard$3.onResponse(BloomKnctDashboard.java:118)  
      at com.android.volley.toolbox.StringRequest.deliverResponse(StringRequest.java:60)  
      at com.android.volley.toolbox.StringRequest.deliverResponse(StringRequest.java:30)  
      at com.android.volley.ExecutorDelivery$ResponseDeliveryRunnable.run(ExecutorDelivery.java:99)  
      at android.os.Handler.handleCallback(Handler.java:751)  
      at android.os.Handler.dispatchMessage(Handler.java:95)

请帮我解析此JSON由GSON。三江源

如果您收到错误，请添加错误日志。 –

我添加了我的错误日志。 @AminMousavi –

我认为这可以帮助你https://stackoverflow.com/a/9598988/2940733 –

答

在您的代码中对此进行更改。

Gson gson = new Gson(); 

Type listType = new TypeToken<List<DashboardPojo_BK>>() {}.getType(); 
List<DashboardPojo_BK> mList = gson.fromJson(response.toString(), listType);

你的代码通过问题解决什么我越来越。 Thankyou –

你可以接受我的回答。@ Abhishekkumar谢谢。 – KeLiuyue

请帮助我多一点，我必须在RecyclerView中设置结果数据。 adapter = new InOutboundAdapter（this，mList.get（0）.getResult（））; recyclerView.setAdapter（adapter）; 我必须发送arrayList到适配器。 –

答

添加这个编译的build.gradle文件相关

compile 'com.google.code.gson:gson:2.8.1'

然后让响应后，就可以解析JSON使用到GSON以下

Type listType = new TypeToken<List<DashboardPojo_BK>>(){}.getType(); 
List<DashboardPojo_BK> responseModel = (List<DashboardPojo_BK>) gson.fromJson(response, listType);

//其中效应初探是字符串你从api响应得到

得到同样的错误@Satender –

答

我不知道为什么根元素是JsonArray，但最好是因为JsonArray而对应循环。尝试下面的代码。

try { 
    JSONArray j = new JSONArray(response); 

    Gson gson = new Gson(); 
    // Parse a json 
    for (int i = 0; i < j.length(); i++) { 
     JSONObject obj = j.getJSONObject(i); 

     DashboardPojo_BK pojo = gson.fromJson(obj.toString(), DashboardPojo_BK.class); 

     if (pojo.getCode().equals("1")){ 
     utils.showtoast("i m here"); 

     // do somthing with pojo 
     } else { 
     utils.hideDialog(); 
     utils.showtoast("Unexpected Response"); 
     } 

    } 

    } catch (JSONException e) { 
    e.printStackTrace(); 
    }

答

你JSON是一个JSONArray，所以你需要分析List<DashboardPojo_BK>，而不是直接解析DashboardPojo_BK。

通过GSON使用Volley获取错误来解析JSON

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